Flavius Josephus, Antiquities of the Jews
William Whiston, A.M., Ed.

[45] When Joshua had thus purified the host, he led them against Ai: and having by night laid an ambush round about the city, he attacked the enemies as soon as it was day; but as they advanced boldly against the Israelites, because of their former victory, he made them believe he retired, and by that means drew them a great way from the city, they still supposing that they were pursuing their enemies, and despised them, as though the case had been the same with that in the former battle; after which Joshua ordered his forces to turn about, and placed them against their front. He then made the signals agreed upon to those that lay in ambush, and so excited them to fight; so they ran suddenly into the city, the inhabitants being upon the walls, nay, others of them being in perplexity, and coming to see those that were without the gates. Accordingly, these men took the city, and slew all that they met with; but Joshua forced those that came against him to come to a close fight, and discomfited them, and made them run away; and when they were driven towards the city, and thought it had not been touched, as soon as they saw it was taken, and perceived it was burnt, with their wives and children, they wandered about in the fields in a scattered condition, and were no way able to defend themselves, because they had none to support them. Now when this calamity was come upon the men of Ai, there were a great number of children, and women, and servants, and an immense quantity of other furniture. The Hebrews also took herds of cattle, and a great deal of money, for this was a rich country. So when Joshua came to Gilgal, he divided all these spoils among the soldiers.